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Finding the Fourth Proportional to 103.05, 154.49 and 75.69

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Solution

The fourth proportional to 103.05, 154.49 and 75.69 is: 113.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.05 : 154.49 = 75.69 : x
  2. Step 2: Convert to fraction form
    103.05/154.49 = 75.69/x
  3. Step 3: Cross multiply
    103.05x = 154.49 × 75.69
  4. Step 4: Simplify right side
    103.05x = 11,692.97
  5. Step 5: Solve for x
    x = 11,692.97/103.05
  6. Step 6: Final answer
    x = 113.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.